An elementary school principal was arrested Friday in Johnson County on suspicion of operating an ATV while under the influence of alcohol.

Peter Jochim, 35, Morgantown, was driving the ATV shortly before 8 p.m. Friday in the area of 4700 West Division Road, Morgantown, according to an Indiana Department of Natural Resources release.

A woman riding on the Polaris side-by-side ATV with Jochim was thrown from the vehicle after Jochim made a sharp left turn, a conservation officer said. Kristina Koons, 32, Martinsville, was taken by ambulance to Community Hospital South in Indianapolis to be treated for a head injury. She was not wearing a helmet, DNR officials said.

Koons works as an aide at the school where Jochim is principal, said Michele Moore, superintendent of Martinsville Schools.

The school district “is cooperating fully with authorities,” Moore said in a prepared statement. “The district is also investigating this incident and will take appropriate action, based upon the investigations by both the district and authorities. Because this case is under investigation and involves a personnel matter, there will be no further statements until all information is gathered.”

Jochim, who is principal of Central Elementary School in Martinsville, spent several hours in jail before being released over the weekend, police said.

The principal was hosting a group of people at his home for an “end-of-the-school-year gathering,” said Jet Quillen, a conservation officer. Asked about the event, school officials said it was an informal gathering and not an official school activity.